Update test.yml

Author: yugpMW

.github/workflows/test.yml

@@ -24,7 +24,7 @@ jobs:
         name: Setup Node.js
         uses: actions/setup-node@v4
         with:
-          node-version: 20.x
+          node-version: 18.x
       - name: Clean install dependencies
         run: npm ci
       - name: Package vsix